Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6a7c140653b59d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 19:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeda003c3fe30b6452013791f5bdd739 SHA-1: 3fac76de7b291eedda541ec0b81f0f3be2af231f SHA-256: db6a7c140653b59d837155d1c5925fb44ea2b309059da6befc5a778bc413d63f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=management+by+objectives+steps
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e349ee48---5752739698.pdf
    • https://bettyloupaints.com/userfiles/files/74965956521.pdf
    • http://bebelino.ru/userfiles/file/20853030521.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b120d568317---44398139097.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t6qsmjg4l6ogr680432l7uh2eq/jikuragir.pdf
    • https://hyosungulf.com/uploads/file/99414025825.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/cs1pc9ien7rlm5lpageiorhdej/ruvotak.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/14ccd3d2b0603bd2824d20e1e85719c9/topekasu.pdf
    • https://happycolaborativo.com/uploads/files/94172514591.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210529_3E86EC8CB06AF62B.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7156d3da2---24831871765.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/jigibubokesexuk.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f39ea0d0729e0511eb894764db337b22/8626698557.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933d519f6f---97436228945.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f441c83a292d924fa34071da6b3d693f/bodozurevubas.pdf
    • http://kolaykanal.com/userfiles/files/19199868808.pdf
    • https://discoverthesky.it/file/44386528244.pdf
    • http://nsfeed.com/_UploadFile/Images/file/677060212.pdf
    • https://tipresentoio.it/images/file/boboputaziwopukajide.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6eb46c9c---79720651863.pdf
    • https://bursac.net/userfiles/file/rinipimufimafedozu.pdf
    • http://mosvag.ru/img/lib/file/gumase.pdf
    • https://ivanda-commerce.hr/userfiles/file/47887924794.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075039aa1102---domulasiresikurakupat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 16792 bytes
font_01_sfnt_off00010709.bin
f600674e3aa01a38ba82373523c7b0e1cbaf8a1ff070623da7bb9ee50b7212be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 15996 bytes
font_02_sfnt_off00013044.bin
f86359978e8e8e7c8871329599fde975d26dc4969a26f3d034283a8ce5e1428f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 11016 bytes